<template>
    <div>
        <!--面包屑导航-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <!--警告区域-->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false"></el-alert>
            <!--选择商品分类区域-->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!--选择商品分类的级联选择框-->
                    <el-cascader
                            expand-trigger="hover"
                            :options="cateList"
                            :props="cateProps"
                            v-model="selectedCateKeys"
                            @change="handleChange"
                            clearable
                    >
                    </el-cascader>
                </el-col>
            </el-row>
            <!--tab 页签区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!--添加动态参数的面板-->
                <el-tab-pane label="用户管理" name="many">
                    <el-button @click="addDialogVisible=true" type="primary" size="mini" :disabled="isBtnDisabled">添加参数</el-button>
                    <!--添加动态参数表格-->
                    <el-table :data="manyTableData" border stripe index-text="#">
                        <!--展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染tag 标签-->
                                <el-tag class="item" closable @close="handleClose(i,scope.row)" v-for="(item,i) in scope.row.attr_vals" :key="i">
                                    {{item}}
                                </el-tag>
                                <!--输入文本框-->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    size="small"
                                    ref="saveTagInput"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" type="danger" size="mini" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!--添加静态属性的面板-->
                <el-tab-pane label="配置管理" name="only">
                    <el-button @click="addDialogVisible=true" type="primary" size="mini" :disabled="isBtnDisabled">添加属性</el-button>
                    <!--添加静态属性表格-->
                    <el-table :data="onlyTableData" border stripe index-text="#">
                        <!--展开行-->
                        <el-table-column type="expand">
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!--循环渲染tag 标签-->
                                    <el-tag class="item" closable @close="handleClose(i,scope.row)" v-for="(item,i) in scope.row.attr_vals" :key="i">
                                        {{item}}
                                    </el-tag>
                                    <!--输入文本框-->
                                    <el-input
                                            class="input-new-tag"
                                            v-if="scope.row.inputVisible"
                                            v-model="scope.row.inputValue"
                                            size="small"
                                            ref="saveTagInput"
                                            @keyup.enter.native="handleInputConfirm(scope.row)"
                                            @blur="handleInputConfirm(scope.row)"
                                    >
                                    </el-input>
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" type="danger" size="mini" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!--添加参数的对话框-->
        <el-dialog
                :title="'添加'+titleText"
                :visible.sync="addDialogVisible"
                width="30%"
                @close="addDialogClosed"
            >
            <!--内容区域-->
            <el-form :model="addForm" :rules="rules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>

            <!--底部区域-->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button @click="addParams" type="primary">确 定</el-button>
            </span>
        </el-dialog>

        <!--编辑参数的对话框-->
        <el-dialog
                :title="'修改'+titleText"
                :visible.sync="editDialogVisible"
                width="30%"
                @close="editDialogClosed"
            >
            <!--内容区域-->
            <el-form :model="editForm" :rules="rules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>

            <!--底部区域-->
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button @click="editParams" type="primary">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
    export default {
        name: "Params",
        data(){
            return {
                cateList:[],
                cateProps:{
                    value:'cat_id',  // 值
                    label:'cat_name',  // 展示的名称
                    children:'children'
                },  // 级联选择框的配置对象
                selectedCateKeys:[],  // 级联选择框双向绑定的数组
                activeName:'many',  // 被激活的页签的名称
                manyTableData:[],  // 动态属性的数据
                onlyTableData:[],  // 静态属性的数据
                addDialogVisible:false,  // 控制添加对话框的显示与隐藏
                addForm:{
                    attr_name:''
                },  // 添加参数的表单数据对象
                rules:{
                    attr_name:[
                        {required:true, message:'请输入参数名称',trigger:'blur'},
                    ]
                },
                editDialogVisible:false,  // 控制修改对话框的显示与隐藏
                editForm:{},  // 修改的表单数据对象
            }
        },
        created(){
            // 获取所有的商品分类列表
            this.getCateList();
        },
        methods:{
            async getCateList() {
                const {data:res} = await this.$http.get('categories');
                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败');
                }
                this.cateList=res.data;
            },
            // 级联选择框选中项变化会触发这个函数
            handleChange(){
                this.getParamsData();
            },
            // activeName 发生变化时触发
            handleTabClick(){
                this.getParamsData();
            },
            // 获取参数的列表数据
            async getParamsData(){
                if(this.selectedCateKeys.length===3){
                    const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}});
                    if(res.meta.status!==200){
                        return this.$message.error('获取参数列表失败')
                    }

                    res.data.forEach(item =>{
                        if(item.attr_vals===''){
                            item.attr_vals=[];
                        }else{
                            item.attr_vals=item.attr_vals.split(' ');
                        }
                        // 控制文本框的显示与隐藏
                        item.inputVisible=false;
                        // 文本框中输入的值
                        item.inputValue='';
                    });

                    if(this.activeName==='many'){
                        this.manyTableData = res.data;
                    }else{
                        this.onlyTableData = res.data;
                    }
                }else{
                    this.selectedCateKeys=[];
                    this.manyTableData=[];
                    this.onlyTableData=[];
                }
            },
            // 监听添加对话框的关闭时间
            addDialogClosed(){
                this.$refs.addFormRef.resetFields();
            },
            // 点击按钮，添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(valid){
                        const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                            attr_name:this.addForm.attr_name,
                            attr_sel:this.activeName,
                        });
                        if (res.meta.status!==201){
                            return this.$message.error('添加失败');
                        }
                        this.$message.success('添加参数成功');
                        this.addDialogVisible=false;
                        this.getParamsData();
                    }else{
                        this.$message.error('请规范输入数据');
                    }
                })
            },
            // 点击按钮，展示修改的对话框
            async showEditDialog(attr_id){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{
                        attr_sel:this.activeName
                    }
                });
                if(res.meta.status!==200){
                    return this.$message.error('获取参数信息失败');
                }
                this.editForm=res.data;
                this.editDialogVisible=true;
            },
            // 重置修改的表单
            editDialogClosed(){
                this.$refs.editFormRef.resetFields();
            },
            // 点击按钮，修改参数信息
            editParams(){
                this.$refs.editFormRef.validate(async valid=>{
                    if(!valid) return this.$message.error('请规范地输入数据')
                    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    });
                    if(res.meta.status!==200){
                        return this.$message.error('修改失败');
                    }
                    this.$message.success('修改成功');
                    this.getParamsData();
                    this.editDialogVisible=false;
                })
            },
            // 根据id 删除对应的参数项
            async removeParams(id){
                const confirmText=await this.$confirm(
                    '此操作将永久删除该参数，是否继续?',
                    '提示',
                    {
                        confirmButtonText:'确定',
                        cancelButtonText:'取消',
                        type:'warning'
                    }
                ).catch(err => err)
                if(confirmText!=='confirm'){
                    return this.$message.info('已取消删除');
                }
                // 删除的业务逻辑
                const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${id}`);
                if(res.meta.status!==200){
                    return this.$message.error('删除参数失败');
                }
                this.$message.success('删除参数成功');
                this.getParamsData();
            },
            // 文本框失去焦点，或摁下 Enter 都会触发
            handleInputConfirm(row){
                if(row.inputValue.trim().length ===0){
                    row.inputValue='';
                    row.inputVisible=false;
                    return ;
                }
                row.attr_vals.push(row.inputValue.trim());
                row.inputValue = '';
                row.inputVisible=false;
                this.saveAttrVals(row);  // 将数据保存到数据库中
            },
            // 点击按钮，展示文本输入框
            showInput(row){
                row.inputVisible=true;
                // 让文本框自动获取焦点
                // $nextTick 的方法作用是 当页面上元素被重新渲染之后，才会执行回调函数中的代码
                this.$nextTick(() =>{
                    this.$refs.saveTagInput.focus()
                })
            },
            // 产出对应的参数可选项
            handleClose(i,row){
                row.attr_vals.splice(i,1);
                this.saveAttrVals(row);  // 将数据保存到数据库中
            },
            // 将对 attr_vals 的操作保存到数据库
            async saveAttrVals(row){
                // 将数据保存到数据库中
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                    {
                        attr_name:row.attr_name,
                        attr_sel:row.attr_sel,
                        attr_vals:row.attr_vals.join(' '),
                    }
                );
                if(res.meta.status!==200){
                    return this.$message.error('修改参数失败');
                }
                this.$message.success('修改参数成功');
            }
        },
        computed:{

            isBtnDisabled(){
                return this.selectedCateKeys.length === 0;
            },
            cateId(){
                if(this.selectedCateKeys.length===3){
                    return this.selectedCateKeys[2];
                }
                return null;
            },
            // 动态计算标题的文本
            titleText(){
                return this.activeName==='many' ? '动态参数' : '静态属性';
            }
        }
    }
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .item{
        margin: 0 10px;
    }
    .input-new-tag{
        width: 150px;
    }
</style>